Hak Suh Kim

Design and implementation of IPC network in ATM switching system

This paper presents an inter-processor communication network (IPC net) for an ATM switching system. In order to provide a stable and independent path for the communication between processors in the system, an additional network (i.e., Ethernet) is implemented. An Ethernet switch binds processors into a work group. The IPC network proposed in this paper assures end-to-end inter-processor connection and uniform 76-98 Mbits/s bandwidth without disturbing the user cell flow of the ATM switch. Advantages of the implemented Ethernet IPC network against other IPC mechanisms (e.g., cell bus etc.) are presented in this paper. Also, stability and expected performance were verified by experiments.

An evaluation method for secure virtual network embedding algorithms

Due to the ossification of the current Internet, it is difficult to launch new service. One of solutions is network virtualization. Numerous virtual network embedding (VNE) algorithms have been proposed in many literatures. But, there is no general methods or frameworks for evaluation of these algorithms. We have analyzed a number of studies, and found appropriate evaluation indexes that can be used in evaluating the functionalities of VNE algorithms. Based on those indexes, we presented a new evaluation method of secure VNE algorithms. To make a virtual network with the various requirements, the infrastructure provider needs effective resource allocation algorithm. The role of VNE is to allocate physical resources to virtual nodes or links to form virtual networks. In order to use the resources of physical networks, appropriate resource allocation algorithms are required. We found a set of evaluation indexes by analyzing the previous proposed researches. Through analysis, we found that our proposed method can be grouped into two functional attributes for classification. One attribute is the basic attributes that mean special features of architecture and the other is the evaluation attributes that perform the assessment of algorithms. We have evaluated the algorithms with our proposed evaluation methods and found to be useful to choose the appropriate algorithm to the infrastructure provider. The proposed method was found to be more convenient to perform the evaluation of the algorithms in real-world simulation. This method helps infrastructure providers to choose the appropriate VNE algorithm.

Efficient reconfigurable bandwidth allocation mechanism for virtual network

Network Virtualization is receiving more and more attention lately. It allows multiple parallel virtual networks to run on the shared physical infrastructure. In virtual network environment, a set of virtual networks share the resource of a common physical network although each virtual network is isolated from others. Therefore, bandwidth allocation mechanism is one of the important problems for network virtualization. We develop bandwidth management system model and propose an algorithm for efficient bandwidth allocation. And, we also evaluate our proposed algorithm.